Microfleece base layer for mixed-output activities in cool temperatures The Rho LT is your lightweight thermal base layer for low and medium output when it’s cold out. The odour-resistant Torrent fabric has a brushed interior that speeds moisture transfer and feels soft. Elastane fibres add stretch and work with the articulated patterning and gusseted crotch for freedom of movement. The waistband is designed for comfort under layers, and a thigh pocket stashes a smartphone.